CVE-2025-9387
📋 TL;DR
This CVE describes an OS command injection vulnerability in DCN DCME-720 web management backend. Attackers can execute arbitrary commands on affected devices by manipulating the 'ip' parameter in the ip_block.php file. This affects DCN DCME-720 devices running version 9.1.5.11 and potentially other products.
💻 Affected Systems
- DCN DCME-720
📦 What is this software?
Dcme 720 Firmware by Dcnetworks
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary commands with web server privileges, potentially leading to data theft, lateral movement, or device takeover.
Likely Case
Remote code execution allowing attackers to modify configurations, install malware, or use the device as a pivot point in the network.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires access to the web management interface but may not require authentication depending on configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UNKNOWN
Vendor Advisory: NONE
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider workarounds or replacement if possible.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to the web management interface to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
File Access Restriction
linuxRemove or restrict access to the vulnerable ip_block.php file.
mv /usr/local/www/function/audit/newstatistics/ip_block.php /usr/local/www/function/audit/newstatistics/ip_block.php.disabled
chmod 000 /usr/local/www/function/audit/newstatistics/ip_block.php.disabled
🧯 If You Can't Patch
- Isolate affected devices in a separate network segment with strict firewall rules.
- Implement web application firewall (WAF) rules to block command injection patterns targeting the ip parameter.
🔍 How to Verify
Check if Vulnerable:
Check if the file /usr/local/www/function/audit/newstatistics/ip_block.php exists and contains unsanitized input handling for the 'ip' parameter.Check Version:
Check device firmware version via web interface or CLI if available.Verify Fix Applied:
Verify that the ip_block.php file is removed/disabled or that input validation prevents command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in web server logs related to ip_block.php
- Failed authentication attempts followed by command execution patterns
Network Indicators:
- Unusual outbound connections from the DCME-720 device
- Traffic patterns suggesting reverse shells or command execution
SIEM Query:
source="web_server" AND uri="*ip_block.php*" AND (param="ip" AND value="*;*" OR value="*|*" OR value="*`*" OR value="*$(*")🔗 References
- https://github.com/lin-3-start/lin-cve/blob/main/DCME-720/DCME-720.md
- https://github.com/lin-3-start/lin-cve/blob/main/DCME-720/DCME-720.md#%E9%AA%8C%E8%AF%81
- https://vuldb.com/?ctiid.321220
- https://vuldb.com/?id.321220
- https://vuldb.com/?submit.630727
- https://github.com/lin-3-start/lin-cve/blob/main/DCME-720/DCME-720.md
- https://github.com/lin-3-start/lin-cve/blob/main/DCME-720/DCME-720.md#%E9%AA%8C%E8%AF%81
